Travis Bunn

Founder, AppealDesk · Published March 27, 2026 · Updated August 19, 2026

Washington Bills Half Your Property Tax on April 30 and Half on October 31. Your Escrow Account Has to Guess Both Numbers a Year Early.

Updated August 2026

Washington is one of the few states that reassesses every parcel every year. That sounds like it should make escrow math easier, since the number never goes stale. It does the opposite. The value your county assessor sets on January 1 of this year does not fund a bill this year. It funds the two installments due next spring and next fall, and by the time either installment is actually collected, the value behind it is well over a year old. Your mortgage servicer's annual escrow analysis has to project both of those installments off whatever number it can find, months before the county has even mailed you a notice of what that number is.

This guide walks through why the gap exists, why the notice you get can arrive almost anywhere in a several-month window depending on which county you live in, and what a Board of Equalization win actually does to an escrow account that has already collected money against the old, higher number.

One Value, Collected a Year Later, in Two Pieces

Under RCW 84.40.020, every parcel in Washington is valued as of January 1 of the assessment year, at 100% of true and fair value under RCW 84.40.030. Under RCW 84.41.030, counties do not do this every few years like most states; they run an active, continuous revaluation program and reassess every parcel annually, with a physical inspection required at least once every six years under the county's approved revaluation plan.

That January 1 value does not become a tax bill right away. The assessor certifies the finished roll to the county treasurer by January 15 of the following year (RCW 84.52.080), the treasurer distributes tax statements by March 15 (RCW 84.56.020), and the bill itself is split into two installments: the first half due April 30, the second half due October 31 of that same year (RCW 84.56.020; confirmed in practice on King County's treasurer FAQ). So a value locked in on January 1 of year one is not fully collected until October 31 of year two, almost 22 months later. Your escrow account has to fund both of those payments from monthly deposits that started well before either due date arrived.

A worked example (hypothetical)

Say a homeowner's parcel is valued at $476,000, Washington's statewide median, as of January 1, 2026. At the statewide effective rate of roughly 0.84%, that pencils out to about $3,998 in tax for the year. The roll certifies to the treasurer by January 15, 2027, the statement goes out by March 15, 2027, and the two installments, about $1,999 each, come due April 30, 2027 and October 31, 2027. (Rates and installment splits vary by taxing district, so treat this as illustration, not a quote.) A servicer setting up escrow in mid-2026 is not projecting a known bill. It is projecting what the January 2026 value will turn into once the roll certifies six months later, in a jurisdiction where 39 counties are all reassessing on their own internal schedules at once.

Why Your Notice Doesn't Arrive on a Fixed Date

Under RCW 84.40.045, an assessor must mail a change-of-value notice within 30 days of finishing the appraisal on your parcel, but the statute also blocks any such notice from going out between January 15 and February 15 each year. Beyond that blackout, there is no single statewide mailing date, because each county runs its own multi-year inspection-area plan (a four-year or six-year cycle, per the Department of Revenue's Revaluation Manual), and a given neighborhood's appraisal work finishes whenever it finishes on that county's internal schedule. The practical result: two homeowners in different Washington counties, sometimes even two homeowners in different parts of the same county, can receive their notices months apart in the same tax year, even though both parcels were valued as of the identical January 1 date.

That spread matters for escrow because a servicer that services loans across multiple Washington counties cannot rely on one calendar date to know when its borrowers' values are even final. It has to react to whichever notices and rolls actually land, county by county, and adjust projections parcel by parcel.

The Board of Equalization Deadline Isn't One Date Either

Under RCW 84.40.038, a petition to the County Board of Equalization is due on or before July 1 of the assessment year, or 30 days after your notice was mailed, or up to 60 days after mailing if your county has adopted a longer local window, whichever of those lands latest. Because notices themselves mail on staggered county schedules, this means your actual personal deadline could be July 1 or it could be well into the fall, depending on when your particular notice went out and what your county's board has adopted. The Board of Equalization can waive even that deadline for good cause (illness, absence from the address, bad advice from county staff, mail delays, or simply never receiving a notice you should have gotten). Always confirm your own deadline with your county assessor or board, never assume July 1 applies to you by default.

Washington runs four appeal levels: informal review with the County Assessor, formal petition to the County Board of Equalization, further appeal to the State Board of Tax Appeals, and finally Superior Court for the largest or most contested disputes. Most homeowners resolve their case at the informal or county board level, before ever needing the state-level appeal.

What a Win Actually Changes, Since the Bill Is Split in Two

Because Washington collects in two installments rather than one lump sum, the timing of your Board of Equalization win relative to April 30 and October 31 determines exactly how much of the year's bill it can still touch. If your case resolves before the roll used to calculate that year's bill is finalized, both installments get corrected. If it resolves after your servicer has already paid the April 30 first half at the old, higher value, that payment is done. The county issues the corrected number, and if a refund is owed on the first half, it flows back to whoever paid it, which for an escrowed loan means your escrow account. The second-half payment due October 31 gets billed at the corrected amount directly, so a mid-year win can still lower what your servicer pays out that October even though it already paid the higher amount in April.

Either way, your monthly payment itself does not move until your servicer's next escrow analysis, governed by 12 CFR 1024.17(c)(3), which only has to happen once per computation year and runs on your loan's own schedule, not Washington's tax calendar. That analysis is where the lower installment (or the refunded overpayment) actually gets reflected in what you owe each month.

Pulling the Correction Forward Instead of Waiting

Regulation X allows, but does not require, a servicer to run an escrow analysis at other points during the computation year (12 CFR 1024.17(f)(1)(ii)). Once your Board of Equalization order and a corrected tax statement or treasurer's notice exist, send both to your servicer's escrow department and ask for an off-cycle re-analysis rather than waiting for the annual one. Many servicers will do this once there is a corrected number on paper to work from; before that, there is nothing for them to act on.

• The Board of Equalization's written order, showing the old and corrected assessed values
• The corrected tax statement or a current printout from the county treasurer reflecting the new installment amounts
• Your loan number and a specific request: re-analyze escrow based on the attached corrected figures
• A request for written confirmation of the new monthly payment and its effective date

If your servicer does not act, the annual analysis still has to catch it. Under 12 CFR 1024.17(f)(2)(i)-(ii), any surplus of $50 or more must be refunded to you within 30 days of that analysis if you are current on the loan. Under 1024.17(c)(5), the cushion your servicer is allowed to hold is capped at one-sixth of estimated annual disbursements, so when the projected bill drops after a win, the maximum allowed cushion drops with it, which is why the eventual refund is often larger than the tax savings alone. Your annual escrow statement, required within 30 days after the computation year ends under 1024.17(i), is where you can check that the corrected, not the original, installment amounts were actually used.

If You're New to the Home

A newly purchased Washington home is where the year-and-a-half lag bites hardest. Your escrow account was likely set up off the seller's last known value or the purchase price, not the January 1 assessed value that will actually determine next year's two installments. If the assessor's current value is meaningfully above your purchase price, that is strong appeal evidence, and it is worth checking as soon as your first change-of-value notice arrives, whenever your particular county happens to send it. Getting ahead of it now avoids a shortage getting spread across your payments later under 12 CFR 1024.17(f)(3), once the real first-half bill lands next April.

None of this appeal process runs through your lender at any stage. Filing with the County Board of Equalization requires nothing from your servicer, and a win obligates them only to eventually collect the smaller amount correctly. The full mechanics of building a Washington case, from comparable sales to the hearing itself, are covered in our Washington property tax appeal guide.

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